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Manufacturing of key equipment for maleic anhydride production technology

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Butadiene Production Technology (RHBD)

Ruihua's technology for butadiene production by oxygen-enriched dehydrogenation of butenes uses different feeding methods and different feed compositions to solve the blockage of the second-stage reactor of the traditional oxidative dehydrogenation process and extend the catalyst operation cycle. Due to the change of the feed composition, the energy consumption of the entire device is greatly reduced.

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1000

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Ethylbenzene/styrene production technology

Changzhou Ruihua Chemical has accumulated more than ten years of experience in ethylbenzene/styrene industrial engineering design, and successfully developed a complete set of ethylbenzene/styrene process technology at the beginning of the company's establishment. After nearly 10 years of technological improvement, the technology package has reached the leading level in all evaluation indicators in the latest equipment currently in operation.

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1000

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Propylene oxide/styrene co-production technology (RHPOSM)

Propylene oxide is the third largest propylene derivative after polypropylene and acrylonitrile. It is mainly used in the production of polyether and propylene glycol. Its derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. . Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products.

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1000

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Expansion Technology for Dry Gas Production of Ethylbenzene

Up to now, some domestic devices in China have applied the technology of producing ethylbenzene/styrene from dry gas, mainly those with an annual output of 60,000 to 80,000 tons of styrene, which are distributed in PetroChina, Sinopec, ChemChina and various private enterprises. The dry gas method was used as a raw material to produce ethylbenzene, which solved the problem of dry gas resource utilization at that time. However, in the actual production for many years, the load of most of the dry gas to ethylbenzene/styrene equipment cannot reach the design value, let alone increase the production capacity to increase the efficiency when the price of styrene rises.

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1000

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Aromatics Production Technology (RHAROM)

Ruihua aromatics production technology can be used to produce benzene, toluene and xylene products. This technology is highly adaptable to the market, and the product scheme can be adjusted according to demand, and it is very competitive in small and medium-sized industrial applications.

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1000

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Para-xylene crystallization technology

The process of separating p-xylene by crystallization is an older process still in use. Before the emergence of adsorption separation technology, the separation of p-xylene by crystallization was the only technology for refining p-xylene. Due to the development of adsorption technology, the existing crystallization technology for the separation of mixed xylenes for equilibrium components no longer has advantages, but the separation of mixed xylenes for high-concentration p-xylene is still attractive.

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1000

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Maleic Anhydride Production Technology (RHMA)

Number of views:

1000

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Low-carbon olefin production technology (RHMTP)

Ruihua C4 cracking unit is transformed into methanol to propylene production technology, which can be used to produce propylene, ethylene, liquefied petroleum gas and aromatic gasoline. This technology is highly adaptable to the market, and the product scheme can be adjusted according to demand, and it is very competitive in small and medium-sized industrial applications.

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1000

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Succinic anhydride production technology

Succinic anhydride is a widely used organic chemical raw material. It can be used to produce vitamins, antibiotics; plant growth inhibitors, chemical intermediates and additives. It can also produce cross-linking agents, light stabilizers, and ultraviolet absorbers for polymer compounds; prepare alkyd resins, anthraquinone dyes, reinforcing fibers, and so on.

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1000

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Energy-saving butadiene production technology

Butadiene ranks second only to ethylene and propylene in petrochemical olefin raw materials. Butadiene is the main raw material for the production of synthetic rubber (styrene butadiene rubber, butadiene rubber, nitrile rubber, and neoprene). With the development of styrene plastics, copolymerization of styrene and butadiene is used to produce various resins with a wide range of uses (such as ABS resin, SBS resin, BS resin, MBS resin), making butadiene increasingly important in resin production status. In addition, butadiene is still used to produce 1,4-butanediol (engineering plastics), dinitrile (nylon 66 monomer), sulfolane, tetrahydrofuran, etc., so it is also an important basic chemical raw material.

Number of views:

1000

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Core equipment

Ethylbenzene/styrene key equipment manufacturing

Number of views:

1000

Keywords:

Manufacturing of key equipment for aromatics production technology

Number of views:

1000

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Manufacturing of key equipment for maleic anhydride production technology

Number of views:

1000

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Manufacturing of key equipment for propylene oxide/styrene co-production technology

Number of views:

1000

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Design and development of SMPO wastewater three-effect evaporator

The wastewater produced in the SMPO production process is extremely difficult to treat due to its high temperature, high alkalinity, and high chemical oxygen consumption characteristics, which makes it difficult for the bacteria to survive biochemical treatment.

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1000

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Manufacturing Technology of Double Tube Sheet Heat Exchanger

Double tube plate is a relatively common structure in heat exchangers in recent years. In order to avoid mixing of the two media in the tube side and the shell side to cause the material to be scrapped or cause a major accident, the double tube plate structure is generally adopted. During the hydraulic test of the equipment, the inner tube sheet leaked, which was difficult to rework, which would cause the equipment to be reworked. Therefore, the difficulty in manufacturing the heat exchanger with this structure was mainly the expansion of the inner tube sheet. If there is no experience in expansion of the same material and specification, expansion simulation test should be done to determine the expansion parameters.

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1000

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Key equipment for p-xylene crystallization process

Number of views:

1000

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Multiple device internals

Since its establishment 7 years ago, our company has provided various types of chemical equipment with multi-patented internals and pipeline mixers, nozzles, distributors, mixers, etc. to ensure the mixing effect of reactant streams and ensure the reaction effect. The company’s research and design in this area has significant advantages. The company has completed the research and design of coal gasifier nozzles, and the research and design of FCC heavy oil catalytic cracking nozzles. The successful research and trial production of these core equipment will bring the company to super Billion in sales. People in the industry are welcome to follow the process requirements, and we will customize them according to the requirements. We will provide a series of services from design to manufacturing, inspection, installation, etc., to relieve users from worries.

Number of views:

1000

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Catalyst

Hβ molecular sieve protective catalyst

As a kind of solid acid catalyst with three-dimensional twelve-element ring channel structure, Hβ molecular sieve has good acidity and thermal stability, and is widely used in alkylation reaction. In addition, the catalyst can effectively remove the basic nitrogen in the raw material.

Number of views:

1000

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Ethanol dehydration/tert-butanol dehydration catalyst

Changzhou Ruihua’s dehydration catalyst (RAO) has the characteristics of high specific surface area, surface acidity, high catalytic selectivity, excellent thermal stability, high mechanical strength, and good particle size, and can be used as a general dehydration catalyst.

Number of views:

1000

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Acetophenone/Dimethyl Adipate Hydrogenation Catalyst

Changzhou Ruihua's hydrogenation catalyst (KAH) has the characteristics of high conversion rate, good selectivity, high mechanical strength, and long life. It can be used as a general hydrogenation catalyst.

Number of views:

1000

Keywords:

Number of views:

1000

Manufacturing of key equipment for maleic anhydride production technology

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Overview

Maleic anhydride is one of the three major acid anhydride raw materials in the world (acetic anhydride, maleic anhydride, phthalic anhydride), and its downstream products have a wide range of development and application prospects, which can be used in synthetic resins, coatings, pesticides, lubricant additives, medicine, and paper Treatment agents, food additives, stabilizers, etc. At present, maleic anhydride production technologies mainly include butane process and benzene process. At present, the production capacity of maleic anhydride in my country is dominated by the traditional benzene process, but with the advancement of the utilization of carbon four resources, the butane process maleic anhydride plant has gradually formed a scale. Ruihua maleic anhydride technology uses n-butane as raw material to produce maleic anhydride by reacting with air. The oxidation reaction is a strongly exothermic reaction, and the heat of reaction needs to be removed during the reaction process, so the maleic anhydride device can output a large amount of steam to the outside. Because of this feature, the maleic anhydride device is suitable for joint installation with some devices with high steam consumption, such as the ethyl styrene styrene device, which can achieve the purpose of steam complementation and improve the economic efficiency of the two devices. Compared with traditional benzene maleic anhydride technology, RHMA technology can completely eliminate benzene's environmental pollution, high maleic anhydride yield, low energy consumption, high steam output, and long operation cycle of the device.

Key equipment

The oxidation reactor developed by Ruikai Chemical Equipment aims at the problems of the axial tube fixed-bed reactor used in the production of maleic anhydride in the industry, and proposes a multi-layer gas distributor with a central guide cone or/ And a new type of reactor with outlet rectifier and vortex breaker with a central deflector cone to form a uniform flow field and eliminate the reflux zone, thereby solving the long-term retention of reactants and reaction products and eliminating undesired side effects. The problem of reaction, while improving the safety of the reactor and improving the energy-saving effect.

The equipment is shown below:

Application examples

The oxidation reactor is installed at the site of the n-butane deep processing industrial chain project of Luoyang Refining and Chemical Jiuyuan Petrochemical Co., Ltd., and its supporting supply equipment: molten salt cooler, electric heater, molten salt pump, molten salt valve, rupture disc are all installed After being delivered in place, the device was officially put into operation in September 2020. According to calculations by relevant personnel in the process department, the reaction yield of maleic anhydride has been significantly increased, and the unit consumption of butane, the raw material for maleic anhydride, has dropped from 1.1 to 1.05t. Butane/t maleic anhydride. The 40,000-ton/year maleic anhydride unit of the project is currently operating stably, and the raw material cost alone will save ~8 million yuan each year. At the same time, the oxidizer "tail-burning phenomenon" did not occur again, which is the first time that this situation has been avoided in the domestic maleic anhydride plant.

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